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Google [and the FCC] wasn't too impressed by Apple's decision to block their Google Voice app from the App Store and has proceeded on another solution. Now they are working on a webapp (something that doesn't need Apple's approval) specifically designed for the iPhone with a appearance identical to the app that Apple rejected.

Google says it is readying a replacement for the Google Voice app that will offer exactly the same features as the rejected app—except that it will take the form of a specialized, iPhone-shaped Web page. For all intents and purposes, it will behave exactly the same as the app would have; you can even install it as an icon on your Home screen.